Bone screw



FIG. 1 is a front, top-right perspective-view of an embodiment of a bone screw;

FIG. 2 is a rear, top-left perspective-view thereof;

FIG. 3 is a top-side view thereof;

FIG. 4 is a bottom-side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a right-side view thereof; and,

FIG. 8 is a left-side view thereof.

Any broken lines provided are for illustrative purposes only, and form no part of the claimed design. 

CLAIM The ornamental design of a bone screw, as shown and described. 